Method of cleansing paper-making machines.



No. 769,691. PATBNTED AUG. 30, 1904.

- I. KITSEE. 'METHOD OF CLEANSING PAPER MAKING MACHINES.

APPLIOATION FILED DEC. 16, 1903.

N0 MODEL.

' UNITED STAT S I Patented August 30, 1904:.

PATENT OFFICE.

. HALF TO CHARLES L. HAMILTON, OF PHILADELPHIA, PENNSYLVANIA.

METHOD. OF CLEANSING PAPER-MAKING MACHINES.

SPECIFICATION forming part of Letters Patent No. 769,091, dated August 30, 1904.

Application filed December 16, 1903. Serial No. 185,461. (No model.)-

To all whom it may concern.-

-Be it known that I, IsIDoR Krrsnn, of the city and county of Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Methods of Cleansing Paper-Making Machines, of which the following is a specification.

My invention relates to paper-making machines, and has more special reference to an improvement in the method of cleansing what is technically called in such machines the dandy and the wire. In another application, for which Letters Patent were granted to me April let, 1903, under Serial No. 725,345, I have described a process by which the screen and dandy of such machines may be cleaned with the aid of the electric current. Such cleansing process has proven successful in such cases where fiber and other impurities have accumulated on the surface of the wire; but in. the process ofcleansing dandies it was found that in some of these parts of the papermachine small woody fibersbecame wedged between the outer wire of the dandy and the inner support. These fibers are, so to speak,

' embedded between two metallic surfaces. The

current therefore cannot reach these fibers.

In practice it was found that where a dandy can be cleaned of the (on the surface) accumulated dirt in about ten minutes with a.

current density of only one ampere for twentyfive square inches such current will not act at all on the fiber wedged in between these-two conducting-surfaces, and a current density of at least one to two amperes per square inch is necessary for the removal of such fiber andeven then it takes a greater length of time. In practice such large amount of current is hardly practical, for the reason that the dandy isusually from ninety to one hundred inches long and about ten to twelve inches in diameter, having, therefore, an exposed surface of fibers, and for this purpose I subjected the whole wire to a heating process; but if the dandy is sub ected as an entirety to a very thought'it expedient to make use of a fine jet of flame directed against the wedged-in fiber, and this expedient proved entirely successful. In such places where a supply of gas is at hand I employ what is known as a Bunsen-burner jet, whereby the supply of gas,

-as well as air, can be. regulated at will and whereby the flame can also be regulated so as to terminate in a point adapted to heat just the surface desired and to thereby char the underlying woody fiber. Where gas'is not conveniently at hand, gasolene, with a blowpipe, may be substituted therefor, and as the fiber is invariably embedded between the metallic spider-support and the wire of the netting no undue contortion of the screen will result. To remove the carbonized fiber, the dandy may be subjected then to the electrolytic process as outlined in the Letters Patcut above mentioned, or the carbonized matter may be removed with the aid of mechanical means, such as rubbing with a brush or blowing off with the aid of a steam-blower.

The use of steel brushes and the use of steamblowers are so well known to persons versed in the art of paper-making that it is unnecessary for me to go into detail here as to the operation of same. have after carbonizing the fiber on part of a dandy removed the same in one series of ex.

periments with the aid of the electrolytic process, in a second series of experiments with periments with the aid of a hand-blower.

5 It suffices to say that I the aid of a brush, and in a third series of ex- I have described the method of carbonizing I the fiber with the aid of'a flame; but it is ob- 'vious that the same result may be attained with an electric current, with the aid of which that part of the dandy where the fiber is embodied may be heated to a degree, so as to carbonize said fiber.

In the drawings, Figure 1 is a sectional elevation of a dandy-roll, illustrating the application thereto of a burner for carbonizing the fiber; and Fig. 2 is a similar view illustrating the application of a blast for removing the fiber after being carbonized.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent. is

1. The method of cleansing a dandy used in paper-machines from the woody fiber embedded therein which consists in first carbonizing said fiber and then removing the carbonized particles.

2. The method of removing particles of fiber embedded between parts of a paper-machine which consists in first earbonizing said particles and then removing said particles.

3. The method of cleansing parts of a papermachine having embedded therein woody fibers which consists in subjecting said fibers to a high temperature thereby breaking up said fibers and then removing the broken-up particles.

t. The method which consists therein that the fibers embedded between the outer netting and the inner support of a dandy are subjected first to a high temperature, thereby carbonizing the same, and are then subjected to a process whereby the charred particles are removed.

In testimony whereof I hereby sign my name, in the presence of two subscribing witnesses,'this 17th day of August, A. D. 1903.

.ISIDOR KITSEE.

Witnesses:

EDITH R. STILLEY, H. G. YETTER. 

